本文選題：風(fēng)電場群　切入點：無功補償　出處：《東北電力大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近幾年，隨著風(fēng)電的大規(guī)模開發(fā)，單機、單場的容量劇增，風(fēng)電場集中接入電網(wǎng)形成了較大規(guī)模的風(fēng)電場群。由于機組出力具有一定的空間耦合特性，大容量的風(fēng)功率波動將惡化局部地區(qū)的電壓、無功狀況。目前，電網(wǎng)調(diào)度對風(fēng)電場接入的技術(shù)管理都是以風(fēng)電場為單位、各自獨立調(diào)節(jié)的方式，無法兼顧地區(qū)電網(wǎng)的調(diào)壓需求。因此，有必要將風(fēng)電場群及其匯集站作為一個整體進行無功電壓統(tǒng)一協(xié)調(diào)控制與管理，通過對風(fēng)電場群無功輸出的協(xié)調(diào)控制，提高整個區(qū)域電網(wǎng)的電壓水平。本文針對大規(guī)模風(fēng)電場群接入電網(wǎng)的現(xiàn)狀，分別就補償點的選址定容和風(fēng)電場群接入地區(qū)的電壓無功控制方法進行研究，通過控制各風(fēng)場無功功率的輸出，維持控制點電壓穩(wěn)定。 本文研究了一種旨在提高風(fēng)電場群并網(wǎng)地區(qū)的電壓穩(wěn)定性的無功補償點選擇和無功補償容量確定的方法。提出了包含綜合靈敏度信息的風(fēng)電場的電壓修正方程，該方程通過雅可比矩陣的降階方法消去了對電壓影響較小的風(fēng)場遠(yuǎn)區(qū)的有功功率波動，得到了更為精確的電壓調(diào)整量和不同區(qū)域的無功補償量對觀測點電壓的靈敏度。通過比較各個補償位置對控制點的靈敏度信息選擇最佳的無功補償位置，并計算需要補償?shù)臒o功調(diào)整量，實現(xiàn)對控制點電壓的無功支撐。 研究了一種旨在提高風(fēng)電場群并網(wǎng)地區(qū)的電壓穩(wěn)定性的電壓無功協(xié)調(diào)控制策略，通過控制各風(fēng)場的無功輸出，維持接入點電壓穩(wěn)定。依次選取具有較大的靈敏度系數(shù)的風(fēng)場作為補償節(jié)點，在滿足運行約束條件的情況下，能有效降低網(wǎng)絡(luò)損耗。同時考慮了不同類型補償設(shè)備的特性，充分利用了每個風(fēng)場的無功補償設(shè)備的無功調(diào)節(jié)能力。 在基于RTLAB的數(shù)模仿真實驗平臺上搭建了某實際風(fēng)電系統(tǒng)模仿真模型，研究接入地區(qū)各風(fēng)電場之間無功/電壓相互協(xié)調(diào)，，提高了風(fēng)電場對接入地區(qū)的無功支撐能力，通過仿真分析，驗證了本文提出的電網(wǎng)無功電壓綜合控制策略的正確性和有效性。
[Abstract]:In recent years, with the large-scale development of wind power, the capacity of single machine and single field has increased dramatically, and the wind farm centralized access to the power grid has formed a large scale wind farm group. Large capacity wind power fluctuations will worsen the voltage and reactive power situation in local areas. At present, the technical management of power grid dispatching for wind farm access is based on wind farms and is regulated independently of each other. Therefore, it is necessary to coordinate the reactive power and voltage control and management of wind farm group and its collection station as a whole, and to control reactive power output of wind farm group by coordinated control. Aiming at the current situation of large-scale wind farm group connecting to the power grid, this paper studies the location of compensation point and the voltage and reactive power control method of wind farm group access area respectively. By controlling the output of the reactive power of each wind field, the voltage of the control point is kept stable. In this paper, a method of selecting reactive power compensation points and determining reactive power compensation capacity is studied to improve the voltage stability of wind farms in grid-connected areas, and a voltage correction equation of wind farms with comprehensive sensitivity information is proposed. The equation eliminates the active power fluctuation in the far region of the wind field, which has little effect on the voltage, by using the Jacobian matrix reduction method. The more accurate voltage adjustment and the sensitivity of reactive power compensation in different regions to the voltage of observation point are obtained. By comparing the sensitivity information of each compensation position to the control point, the optimal reactive power compensation position is selected. The reactive power adjustment amount needed to be compensated is calculated, and the reactive power support to the voltage of the control point is realized. In this paper, a coordinated control strategy of voltage and reactive power is studied to improve the voltage stability of wind farm cluster in grid-connected area. By controlling the reactive power output of each wind field, In order to maintain the voltage stability of the access point, the wind field with a large sensitivity coefficient is selected as the compensation node in turn, which can effectively reduce the network loss under the condition of satisfying the operating constraints. At the same time, the characteristics of different types of compensators are considered. The reactive power regulation ability of the reactive power compensation equipment in each wind field is fully utilized. In this paper, a simulation model of wind power system based on RTLAB is built, and the reactive power / voltage coordination among wind farms in the access area is studied, which improves the reactive power supporting ability of wind farm to the access area. The simulation results show that the proposed reactive power and voltage integrated control strategy is correct and effective.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM614;TM921.5

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